CN101584131A - Satellite communication system and method with asymmetric feeder and service frequency bands - Google Patents
Satellite communication system and method with asymmetric feeder and service frequency bands Download PDFInfo
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Abstract
System and method for communicating data in a multibeam satellite system having feeder beams associated with a plurality of gateways and a plurality of service beams associated with a plurality of user subscriber terminals utilizing frequency re-use by service beams between a satellite and a plurality of subscriber terminals, wherein the service beams are transmitted to and from the satellite by re-using at least one common frequency channel of the service beam, such that the beam allocation is asymmetric among available frequency channels. The result is a potential for reduction of transponder resources.
Description
The cross reference of relevant or other applications
The application advocates the rights and interests of U.S. Provisional Patent Application sequence number 60/870,080 under U.S.C 119 (e) of application on December 14th, 2006.
Before submitting this priority application in 75 days other patent application application, that relate to total theme of the present invention and be transferred to assignee of the present invention including, but not limited to following:
The tabulation of patent application
No. the 60/827924th, U.S. Provisional Patent Application (agent registration 017018-008000US) application on October 3rd, 2006, " Adaptive Use of Satellite Uplink Bands " by name;
No. the 60/827927th, the U.S. Provisional Patent Application (agent registration 017018-008300US) of " the Frequency Re-use for Service and GatewayBeams " by name of application on October 3rd, 2006;
No. the 60/827959th, U.S. Provisional Patent Application (agent registration 017018-008500US) application on October 3rd, 2006, " Satellite Architecture " by name;
No. the 60/827960th, the U.S. Provisional Patent Application (agent registration 017018-008600US) of " the Piggy-back Satellite Architecture " by name of application on October 3rd, 2006;
No. the 60/827964th, U.S. Provisional Patent Application (agent registration 017018-008800US) application on October 3rd, 2006, " Placement of Gateways Away fromService Beams " by name;
No. the 60/828021st, U.S. Provisional Patent Application (agent registration 017018-007700US) application on October 3rd, 2006, " Mulit-Service Provider SubscriberAuthentication " by name;
No. the 60/828033rd, U.S. Provisional Patent Application (agent registration 017018-008200US) application on October 3rd, 2006, " Large Packet Concatenaion in SatelliteCommunication System " by name;
No. the 60/828037th, U.S. Provisional Patent Application (agent registration 017018-010500US) application on October 3rd, 2006, " Upfront Delayed Concatenation InSatellite Communication System " by name;
No. the 60/828014th, U.S. Provisional Patent Application (agent registration 017018-010600US) application on October 3rd, 2006, " Map-Trigger Dump Of Packets InSatellite Communication System " by name;
No. the 60/828044th, U.S. Provisional Patent Application (agent registration 017018-010700US) application on October 3rd, 2006, " Web/Bulk Transfer Preallocation ofUpstream Resources In A Satellite Communication System " by name;
No. the 11/538431st, U.S.'s partial continuous patent application (agent registration 017018-001212US) application on October 3rd, 2006, " Code Reuse Mulitple Access For ASatellite Retrun Link " by name;
No. the 11/538429th, U.S.'s partial continuous patent application (agent registration 017018-006110US) application on October 3rd, 2006, " Method for Congestion Management " by name;
No. the 60/827985th, U.S. Provisional Patent Application (agent registration 017018-008900US) application on October 3rd, 2006, " Aggregate Rate Modem " by name;
No. the 60/827988th, U.S. Provisional Patent Application (agent registration 017018-009000US) application on October 3rd, 2006, " Packet Reformatting for DownstreamLinks " by name;
No. the 60/827992nd, U.S. Provisional Patent Application (agent registration 017018-009100US) application on October 3rd, 2006, " Downstream Waveform Modification " by name;
No. the 60/827994th, U.S. Provisional Patent Application (agent registration 017018-009200US) application on October 3rd, 2006, " Upstream Resource Optimization " by name;
No. the 60/827999th, U.S. Provisional Patent Application (agent registration 017018-009300US) application on October 3rd, 2006, " Upstream MF-TDMA FrequencyHopping " by name;
No. the 60/828002nd, U.S. Provisional Patent Application (agent registration 017018-009400US) application on October 3rd, 2006, " Downstream Virtual ChannelsMulitplexed on a Per Symbol Basis " by name;
No. the 60/827997th, U.S. Provisional Patent Application (agent registration 017018-010800US) application on October 3rd, 2006, " Modified Downstream Waveform " by name;
No. the 60/828038th, U.S. Provisional Patent Application (agent registration 017018-009500US) application on October 3rd, 2006, " Adapted DOCSIS Circuit for SatelliteMedia " by name;
No. the 60/828045th, U.S. Provisional Patent Application (agent registration 017018-009700US) application on October 3rd, 2006, " Satellite Downstream Virtual Channels " by name;
No. the 60/828035th, U.S. Provisional Patent Application (agent registration 017018-010300US) application on October 3rd, 2006, " Satellite Broadbank with Less than OneCountry of Coverage " by name;
No. the 60/828032nd, U.S. Provisional Patent Application (agent registration 017018-010100US) application on October 3rd, 2006, " Multi-User Detection in Satellite ReturnLink " by name;
No. the 60/828034th, U.S. Provisional Patent Application (agent registration 017018-010200US) application on October 3rd, 2006, " Multi-rate Downstreaming in MulitpleVirtual Channel Enviorment " by name;
No. the 60/828047th, U.S. Provisional Patent Application (agent registration 017018-009900US) application on October 3rd, 2006, " Satellite Upstream Load Balancing " by name;
No. the 60/828048th, U.S. Provisional Patent Application (agent registration 017018-010000US) application on October 3rd, 2006, " Satellite Upstream/Downstream VirtualChannle Architecture " by name; And
No. the 60/828046th, U.S. Provisional Patent Application (agent registration 017018-009800US) application on October 3rd, 2006, " Virtual Downstram Channel LoadBalancing " by name.
The statement of the right of the invention of being carried out down about joint study or exploitation
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To " sequence table ", the reference of form or the computer program of having listed annex submitted to by CD
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Background technology
The application generally relates to radio communication, particularly the satellite communication network of applying frequency reuse technology.
Along with the startup of the interspace Network of using the Ka band satellite, consumer's broadband satellite business is obtaining attraction in the North America.First generation satellite system although it is so can provide all told of a plurality of gigabits of every satellite per second (Gbps), but the design of such system has limited the consumer's that can be served fully quantity inherently.In addition, the fact of striding a plurality of overlay areas dispersion capacity has further limited the bandwidth of each user (subscriber).
Although existing design has a plurality of capacity limit, for the still sustainable growth of demand of such broadband services.Several years in past have been seen the powerful advantages in communication and the treatment technology.In conjunction with the system and the element design of selected innovation, this technology can be utilized to produce new wireless communication system and solve this demand.
Utilizing frequency reuse in the cellular services area of coverage (footprint) to come communication data in multibeam satellite system is the known technology of attempting to solve frequency and spatial limitation.The business beam that comprises uplink service wave beam and downlink traffic wave beam between satellite and a plurality of user terminal can acquisition frequency and polarization time slot (polarization slot), and each business beam is served specific cell or business beam overlay area.By reusing at least one common uplink channel a plurality of uplink service wave beams are sent to satellite, and by reusing at least one common downlink channel from a plurality of downlink traffic wave beams of satellite transmission.Described method further is included in and sets up at least one feeder beam that is made of uplink feeder beam and downlink feeder beam between satellite and the gateway terminal, described at least one feeder beam is associated with the feeder beam overlay area of separating with a plurality of business beams overlay area, to form a plurality of downlink traffic wave beams, receive a plurality of uplink service wave beams at the satellite place in satellite place receiving uplink feeder beam to form downlink feeder beam.By reusing at least one common uplink channel uplink feeder beam is sent to satellite, and by reusing at least one common downlink channel from the satellite transmission downlink feeder beam.
Though some satellite configuration causes the poor efficiency of bandwidth and resource allocation, this means the unnecessary and useless facility of Piggybacking of Known designs and configuration, cause carrying too much additional weight, thereby influence the global design and the specification of satellite and carrier rocket.Thus, what is unnecessary device requirement not only to expect identification, also needs to provide the satellite configuration of optimizing satellite size, weight and link budget better.
Summary of the invention
According to the present invention, use asymmetric feeder line and service frequency bands with communication data in serving the multibeam satellite system of a plurality of service areas based on the method for mathematical color mapping techniques (mathematical color mappingtechnique).According to industrial practice, each color is characterized by unique frequency band and unique antenna polarization.Each gateway provides the uplink feeder beam of being made up of the signal of a plurality of different colours, and in each business beam, user terminal is separated by the color assignment of lesser number.In one embodiment, each color is corresponding to similar bandwidth signal.
In one embodiment, modification is used for the tradition four look re-use pattern therefors of distributing point overlay area, thereby the ratio of some in this pattern in four kinds of colors is unequal, allow the asymmetric traffic frequencies on service downlinks to use thus, and need on number, be less than tradition to the type of frequency converter thus.The present invention also provides, and uplink service links is used three identical frequency bandwidths, and each frequency bandwidth has two orthogonal polarizations, and two frequency bandwidths of downlink feeder links application, and each frequency bandwidth has two orthogonal polarizations.Reuse the frequency between up link and the down link according to the present invention, this has reduced the required number of spaceborne separation and unique element asymmetricly.
According to an embodiment, at least one uplink feeder beam comprises six carrier waves, wherein this wave beam comprises three channels, each of three channels is operationally separated with left-hand circular polarization (LHCP) by right-handed circular polarization (RHCP), forming six unique combinations of frequency and polarization (color), and wherein these six carrier waves each only in six unique combinations of frequency of utilization and polarization send.
Another aspect according to embodiment, the downlink traffic wave beam comprises of four carrier waves, wherein select carrier wave from two frequency bands, each of these two frequency bands can be separated with left-hand circular polarization (LHCP) by right-handed circular polarization (RHCP), to form four unique combinations of frequency and polarization (color), and wherein according to four look patterns, one of each frequency of utilization of four carrier waves and four unique combinations of polarization is sent to spot beam cells.
Because a gateway can be handled more wave beam, therefore the frequency reuse mechanism of six colors of the every gateway of application according to the present invention will reduce the demand of five gateways, thereby ten gateways are used to have the system of 60 business beams altogether.
Can find relevant another background of the present invention in the relevant sequence number 60/827928 of patent application of pending trial that be hereby expressly incorporated by reference, common, this background has provided another kind of Frequency Distribution mechanism.
To understand the present invention better with reference to following embodiment in conjunction with the drawings.
Description of drawings
Figure 1A and Figure 1B explanation is according to forward direction and the reverse path communication between single gateway and one group of spot beam service areas of the present invention.
Fig. 2 A and Fig. 2 B explanation can be by the service planes of spot beam on a large scale according to of the present invention ten gateway service.
Fig. 3 specifies according to the service reuse to frequency 2 downlink right polarization and frequency 1 downlink left polarization of the present invention.
Fig. 4 specifies according to the service reuse to frequency 2 downlink left polarization and frequency 1 downlink right polarization of the present invention.
Fig. 5 specifies according to the service reuse to frequency 1 uplink left polarization and frequency 2 uplink right polarization of the present invention.
Fig. 6 specifies according to the service reuse to frequency 1 uplink left polarization and frequency 1 uplink right polarization of the present invention.
Fig. 7 is the diagram according to upstream transponder of the present invention.
Fig. 8 is the diagram according to downstream translator of the present invention.
Embodiment
Said method relates to a kind of satellite system, and this satellite system adopts a plurality of other frequency reuses of level in asymmetric mode, thus the use and the simplified system hardware of maximization usable frequency bandwidth.Make different business beams can take the common channel except a plurality of business beam applying frequencies are reused, this system also comes further between business beam and feeder beam applying frequency to reuse by gateway is positioned in the scope of separating with the overlay area of business beam.In addition, also feeder beam and business beam are used asymmetric frequency reuse to allow to increase gateway efficiency.
Figure 1A and 1B are the diagrams of the satellite system of structure according to the present invention.In the north in diagram zone, gateway GW is structured in the area of coverage of the spot beam that is formed by the directional antenna in the satellite side.This wave beam is called as feeder beam and is made up of feeder uplink from the gateway to the satellite and the feeder downlink from the satellite to the gateway.On satellite, exist extra antenna element to be used for the business beam of user terminal with generation.Business beam is by forming to the service downlinks of user terminal with to the service uplink of satellite.Although beam modes depends on antenna type and easier of usually circular, purpose for convenience is shown hexagon with business beam.A plurality of user terminals are positioned at each business beam, obtain data service (for example internet access etc.) and realize network control algorithm (for example coordinating the use of the public back channel between the user identical business beam) with gateway communication and from gateway.By the signal colour (signal color) in the character string identification wave beam of three characters.First character recognition frequency band number (1,2 or 3).Second character recognition direction (going up behavior U, following behavior D).The antenna polarization of the 3rd character identification signal (L is left-handed, and R is dextrorotation).Thus, signal 1UL is the uplink signal to satellite in first frequency band, and this signal application left-handed polarization.
Figure 1A shows at gateway side and begins and at subscriber terminal side signal path that finish, that be called as forward direction or downstream direction.In this example, business beam is supported two different frequency bands by two different antenna polarizations, forms known four chrominance signals that can use with four look re-use pattern therefors between adjacent beams thus.In traditional system, gateway GW can be will be formed four kinds of colors using by the four look feeder signals (1UL, 1UR, 2UL, 2UR) of satellite relay in service area being mapped to business beam (1DL, 1DR, 2DL, 2DR).According to one embodiment of present invention, on feeder beam, use another frequency band, thus extra color 3UL and the 3UR that produces as in Figure 1A, be represented by dotted lines.Owing to only exist four colors to be used for business beam, therefore according to the present invention in 3UL and the 3UR signal each is converted to of service downlinks color, is converted to 1DR and 1DL (shown in broken lines) in this example to serve corresponding hacures wave beam zone.In this representational embodiment, all user terminals in given service beam target area receive identical downstream data flow signal and therefrom extract interested part signal.
Figure 1B shows the reverse path (upstream direction) from user or user terminal to gateway GW.For each business beam, user terminal sends the service uplink signal that receives at the common satellite antenna place separately.In this example, on satellite, may there be at least six such reception antennas in some cases.Then, by satellite with the feeder beam color of correspondence will this compound received signal downlink relay to gateway GW.As in the forward direction, color map is asymmetric.Service uplink color 1UR is converted into feeder downlink color 3DR in this example, and service uplink color 1UL is converted into feeder downlink color 3DL.
In this application, each gateway GW uses all available colors to its feeder beam.Therefore, in order to prevent to disturb, separate by the mapping of four looks as the business beam of similar color, feeder beam must be separated from each other as far as possible far.In the example shown in Figure 1A and the 1B, four unblanketed business beams are by a gateway service.In traditional system, add extra hypographous business beam and will need another gateway with the fine separation of original gateway GW.Yet according to one embodiment of present invention, original gateway GW can handle this extra service area now.
Four look re-use pattern therefors can be used to cover any surface, keep the distance between the similar color to be in minimum threshold or to be higher than minimum threshold simultaneously.Yet according to the shape on the surface that will be capped, the required number of times of each color may be unequal.For example, in the system of Figure 1A, color 1DL and 1DR are used twice, and color 2DL and 2DR each only be used once.Fig. 2 A and 2B show this color ratio phenomenon.In Fig. 2 A, stride new-world continuous user area by 60 beams serves for one with 20 1DL, 20 1DR, 10 2DL and 10 2DR service downlinks.In Fig. 2 B, stride most of new-world discontinuous user area by another 60 beams serves for two with 20 1DL, 20 1DR, 10 2DL and 10 2DR service downlinks.For these figure, gateway is positioned at separate areas and is not illustrated.Noticeable, only need 10 gateways to handle 60 down links, rather than 15 gateways in the traditional design.
There is shown the execution mode of a signal of the part (this part is specifically designed to the signal of processing from a gateway) of satellite constructed according to the invention in the function of Fig. 3.Show the embodiment of forward link distribution system 1200 with reference to figure 3.As shown in the figure, gateway 115 is connected to the antenna subsystem 110 that generates 6 downstream data flow signals.The single carrier that each use of 6 downstream uplink 135 is had the 500MHz frequency spectrum.In this embodiment, totally 3 frequencies allow 6 downstream uplink of separating 135 with 2 polarization, and only use the 1.5GHz frequency spectrum.
6 " bend pipe " that satellite 105 is expressed as between feeder line and the service link functionally connects.105 " bend pipes " connection via satellite changes carrier frequency and polarised direction.Satellite 105 is a downstream downlink signal 150 with each downstream uplink 135 conversion of signals.
In this embodiment, have 6 downstream downlink 150, each downstream downlink 150 is provided for the service link of 6 spot beams 205.As situation in the present embodiment, downstream downlink 150 can change the frequency in the bend pipe.For example, downstream uplink A135-A 105 changes into second frequency (for example Freq1D) from first frequency (for example Freq 1U) via satellite.Other embodiment also can change the up link of given downstream channel and the polarization between the down link.Some embodiment can use identical polarization and/or frequency with down link to the up link of given downstream channel.
Here, the link A-D of the standard symmetrical system of only using two feeder uplink frequency bands link E and F have been added.Link E and F use the 3rd frequency band to generate to have corresponding left-handed polarization and two extra transmission signals of right-hand polarization.Fig. 3 also shows the frequency inverted that on satellite each signal path is taken place.As mentioned above, preceding 4 signals are transformed into 1D and 2D from frequency band 1U and 2U respectively simply.Then, the 3rd uplink frequency 3U is converted into 1D in upper path and the 2D in the bottom path.The use of the 3rd frequency has produced the needs to new frequency translation element, but the sum of frequency translation paths still is fixed on the sum of business beam.
In order to be created on whole four colors (1DL, 1DR, 2DL, 2DR) of using in the business beam, must have two extra frequency converter: 3U → 1D and 3U → 2D.Each parts must be suitable for space and must be standby to be used for redundancy on spacecraft.By a frequency being joined our feeder beam, the number of frequency inverted type is doubled to 4 from 2.Based on system requirements, finish the mapping from the feeder beam to the business beam in any that can be in a plurality of displacements.
According to another embodiment of the invention, on satellite, only use the frequency inverted of an additional type.As shown in Figure 4, frequency band 3U always is converted into frequency band 1D.For the system of 60 wave beams illustrating,, produce 10 business beams of each color 1DL, 1DR, 2DL and 2DR with 40 wave beams of canonical transformation generation of 1U → 1D and 2U → 2D.20 residue wave beams that produce from the 3U band signal will be divided between 1DL and the 1DR fifty-fifty, produce 20 1DL wave beams, 20 1DR wave beams, 10 2DL wave beams and 10 2DR wave beams altogether.
Below with reference to Fig. 5, show the embodiment of return link distribution system.This embodiment shows 6 upstream up links 145 from 6 groups of user terminals 125." bend pipe " satellite 105 obtains upstream up link 145, selectively changes carrier frequency and/or polarization (not shown), then they is redirected to spot beam 225 as upstream downlink 140.In this embodiment, carrier frequency changes between up link 145 and down link 140, but polarization remains unchanged.Because feeder line spot beam 225 is not positioned at the overlay area of business beam, thus identical frequency to can being reused in service link 145 and feeder link 140 alternatively, but it is right not reuse identical frequency usually by this way.
Here, the link 140-A to 140-D of traditional symmetrical system of only using two feeder uplink frequency bands link 140-E and 140-F have been added.Link 140-E and 140-F use the 3rd frequency band to produce to have corresponding left-handed polarization and two extra transmission signals of right-hand polarization.Fig. 5 also shows the frequency inverted that takes place for each signal path on satellite.As mentioned above, preceding 4 signals are transformed into 1D and 2D from frequency band 1U and 2U simply respectively.The 3rd uplink frequency 1U is converted into 3D in the upper path of link 140-E then, and is converted to 3D from 2U in the bottom path of link 140-F.The 3rd use of frequency on down link produced the needs to new frequency translation components, but the sum of frequency translation paths still is fixed on the sum of business beam.
As shown in Figure 5, for whole 4 colors (1UL, 1UR, 2UL, 2UR) that will use in the business beam are sent to 6 colors (1DL, 1DR, 2DL, 2DR, 3DL, 3DR) of using in the feeder beam, must have two extra frequency converter: 1U → 3D and 2U → 3D.Each parts must be suitable for space and must be standby to be used for redundancy on spacecraft.By a frequency is joined feeder beam, the number of frequency inverted type is doubled to 4 from 2.Based on system requirements, finish the mapping from the feeder beam to the business beam in any that can be in a plurality of displacements.
According to another embodiment of the invention, on satellite, only use the frequency inverted of an additional type.As shown in Figure 6, in link E and this 3rd pair of link of link F, the single frequency band of point 5 and point 6 is converted into frequency band 3D.For the system of 60 wave beams illustrating,, produce 10 business beams of each color 1UL, 1UR, 2UL and 2UR with 40 wave beams of canonical transformation generation of 1U → 1D and 2U → 2D.20 residue wave beams in the 3D band signal will be divided between 1UL and the 1UR fifty-fifty, produce 20 1UL wave beams, 20 1UR wave beams, 10 2UL wave beams and 10 2UR wave beams altogether.
For purpose relatively, the system of 60 user wave beam of signal, 4 look re-use pattern therefors of traditional symmetry cause the channel Mapping shown in the table 1.There are 15 gateways (one of each feeder beam).
The downstream service of table 1. symmetry and feeder channel mapping
Yet according to one embodiment of present invention, the system of 60 user wave beam has asymmetric business and feeder beam.Here, 4 colors are used for user wave beam and 6 colors are used for feeder beam.Table 2 shows downstream data flow mapping, and only 10 feeder beam (and 10 gateways) thus produce whole 60 signals that are used for business beam.First feeder beam comprises 6 feeder beam signals, this causes at frequency 1D 4 business beams being arranged, and two wave beams are arranged at frequency 2D, and second feeder beam comprises 6 feeder beam signals simultaneously, and this causes four business beams being arranged and at frequency 1D two business beams being arranged at frequency 2D.This pattern repeats 4 times in 10 feeder beam again, produces 30 wave beams (half has a kind of polarization, and half has another kind of polarization) of each frequency thus.
Table 2: have equal color ratio, the mapping of asymmetric downstream service and feeder channel according to another embodiment of the invention, the system of 60 user wave beam has asymmetric business and feeder beam, and further uses the business beam color of unequal ratio.Equally, 4 colors are used for user wave beam and 6 colors are used for feeder beam.Table 3 shows the downstream data flow mapping, and equally only 10 feeder beam (10 gateways thus) produce whole 60 signals that are used for business beam.All feeder beam comprise 6 feeder beam signals now, and this causes at frequency 1D 4 business beams being arranged, and at frequency 2D two business beams is arranged, and are created in 40 wave beams of frequency 1D thus and at 20 wave beams of frequency 2D.Half of these wave beams has a kind of polarization, and half has another kind of polarization.
Table 3: have unequal color ratio, the mapping of asymmetric downstream service and feeder channel
With reference to figure 7, show the embodiment of upstream transponder 504 with the block diagram form.Each receives the whole return link information by the zone of service point wave beam (as illustrated before) definition to receiver and low-converter (Rx/DC) piece 616-1 to 616-60, as being transformed to intermediate frequency (IF) analog signal before.There is a Rx/DC piece 616 for each professional spot beam zone.IF switch 612 is routed to particular upstream downlink channel from Rx/DC piece 616-1 to 616-60 with particular baseband signal.Use upconverter and travelling-wave tube amplifier (UC/TWTA) piece 620-1 to fill upstream downlink feeder channel to 620-60.Can handle change frequency and/or polarization by this, make each upstream channel with bend pipe form via satellite 105.
Gateway 1 has 6 UC/TWTA piece 620-1 of its special use to 620-6 in upstream transponder 504.Three piece 620-1 in the UC/TWTA piece of 6 special uses operate on three frequencies of first group to present by left-handed polarization to 620-3, and three UC/TWTA piece 620-4 operate to present by right-hand polarization on first group identical frequency to 620-6.Each piece in ten pieces of 6 travelling wave tube has similar configuration, for example UC/TWTA620-55,620-56 and 620-57 and UC/TWTA620-58,620-59 and 620-60 pairing.Between two of every group of travelling wave tube polarization and three frequencies, satellite 105 can be communicated by letter with corresponding gateway 115 by the upstream downlink feeder channel of 6 separation.
Below with reference to Fig. 8, show the embodiment of downstream translator 508 with block diagram.Each gateway 115 produces 6 downstream uplink Traffic Channels of satellite 105 by using three frequency ranges and two polarization.Rx/DC piece 636-1 obtains analog signal from serving corresponding gateway GW1 to the spot beam anternma of GW10 to 636-60, and is intermediate frequency with this conversion of signals.There is Rx/DC piece 636 in whole 60 downstream uplink Traffic Channels from 10 gateways 115.Intermediate frequency switch 628 is connected to specific channel with specific service point wave beam from gateway 115 by spot beam anternma.UC/TWTA piece 632-1 uses specific frequency that each the IF signal from switch 628 is carried out up-conversion and amplification to 632-60.The signal broadcasting that 60 spot beam anternmas will correctly polarize is to designated cell that comprises user terminal or spot beam zone.As upstream translator 504, downstream translator 508 also can change the carrier frequency and the polarization of specific downstream channel with the bend pipe form.
The asymmetric frequency and the polarized meter of signal are shown below.Here, " color " of signal represented by three character symbols.For example, first color is 1UL-first uplink band (being 28.1-28.6GHz in this example).
| Signal | 18.3-18.8 GHz | 18.8-19.3 GHz | 19-7-20.2 GHz | 28.1-28.6 GHz | 28.6-29.1 GHz | 29.5-30.0 GHz |
| Uplink feeder | 1UL 1UR | 2UL 2UR | 3UL 3UR | |||
| Downlink traffic | 1DL 1DR | 2DL 2DR | ||||
| Uplink service | 1UL 1UR | 2UL 2UR | ||||
| Downlink feeder | 1DL 1DR | 2DL 2DR | 3DL 3DR |
Although described the present invention, it is evident that to those skilled in the art scope of the present invention is not limited to described specific embodiment by specific embodiment.Correspondingly, specification and accompanying drawing should be considered to example rather than restriction.Yet, clearly, can under the situation of the wider scope and spirit that do not depart from the invention that claim sets forth, add, remove, substitute and other modification.
Claims (16)
1. one kind is passed through feeder line frequency band and service frequency bands method for communicating between central source and a plurality of user terminal in satellite communication system, and described method comprises:
Generate uplink feeder beam and downlink feeder beam, described uplink feeder beam and downlink feeder beam are associated with a plurality of gateways via satellite, described uplink feeder beam and described downlink feeder beam characterize by the feeder signals of selecting to have the first frequency and the first polarization time slot, and each described feeder signals is corresponding with the different colours during first color in the color map is selected, and each color is characterized by unique frequency band and unique polarizations; And
Generate a plurality of uplink service wave beams and downlink traffic wave beam, described uplink service wave beam and downlink traffic wave beam are associated with a plurality of user terminals via satellite, described business beam characterizes by selecting the second frequency and the second polarization time slot, and each described feeder signals is corresponding with the different colours during second color in described color map is selected, described second color is chosen in and quantitatively is less than described first color selection, makes that feeder line frequency band and service frequency bands are asymmetric in available channel.
2. method according to claim 1 further may further comprise the steps:
Reuse the frequency in the feeder beam between described satellite and described a plurality of gateway, wherein, at least one common channel of reusing feeder beam is sent to satellite with the gateway wave beam and from satellite transmission gateway wave beam, makes that the frequency of feeder beam and the distribution of polarization time slot are asymmetric.
3. one kind is passed through feeder line frequency band and service frequency bands method for communicating between central source and a plurality of user terminal in satellite communication system, and the improvement in the described method comprises:
Modification is used for four look re-use pattern therefors of distributing point overlay area, make that the ratio of selection grouping of four colors in described pattern is unequal, allow the asymmetric traffic frequency on service downlinks to use thus, and need on number, be less than tradition to the type of frequency converter thus.
4. method according to claim 3, wherein, uplink service links is used three identical frequency bandwidths, each frequency bandwidth has two orthogonal polarizations, and downlink feeder links is used two frequency bandwidths, each frequency bandwidth has two orthogonal polarizations, and wherein asymmetric frequency bandwidth of reusing between uplink feeder link and the downlink feeder links, to reduce the required number of separation and the unique element on the satellite.
5. method according to claim 3, wherein, at least one uplink feeder beam comprises six carrier waves, wherein said wave beam comprises three channels, each of described three channels is operationally separated with left-hand circular polarization (LHCP) by right-handed circular polarization (RHCP), forming six unique combinations of frequency and polarization (color), and wherein said six carrier waves each only in six unique combinations of frequency of utilization and polarization send.
6. method according to claim 3, wherein, the downlink traffic wave beam comprises of four carrier waves, wherein select carrier wave from two frequency bands, each of described two frequency bands can be separated with left-hand circular polarization (LHCP) by right-handed circular polarization (RHCP), with four unique combinations of formation frequency and polarization (color), and wherein according to four look patterns, one in four unique combinations of each frequency of utilization of four carrier waves and polarization is sent to spot beam cells.
7. method by frequency reuse communication data in multibeam satellite system comprises:
Feeder beam and business beam are provided, described feeder beam and business beam comprise uplink feeder beam and the downlink traffic wave beam repeater satellite and a plurality of user terminal from gateway ground station to repeater satellite, each business beam and different being associated to the nonoverlapping business beam of small part overlay area are to form a plurality of business beams overlay area;
Wherein described a plurality of downlink traffic wave beams are sent to user terminal, the distribution of asymmetric ground allocation of downlink business beam channel in available down-link frequencies by reusing at least one common downlink channel.
8. method of utilizing frequency reuse communication data in multibeam satellite system comprises:
Feeder beam and business beam are provided, described feeder beam and business beam comprise uplink service wave beam and the downlink feeder beam between satellite and a plurality of gateway, each feeder beam and different being associated to the nonoverlapping business beam of small part overlay area are to form a plurality of feeder beam overlay area;
Wherein described a plurality of uplink service wave beams are sent to satellite by reusing at least one common uplink channel, and relevant downlink feeder beam merges the information of described a plurality of uplink service wave beams of described satellite reception, and described satellite is reused to receive described at least one common uplink channel.
9. system that utilizes frequency reuse communication data in multibeam satellite system comprises:
Gateway ground station, feeder beam and business beam are provided, described feeder beam and business beam are included in the uplink feeder beam and the downlink traffic wave beam between repeater satellite and a plurality of user terminal of repeater satellite, each business beam and different being associated to the nonoverlapping business beam of small part overlay area are to form a plurality of business beams overlay area;
Wherein described a plurality of downlink traffic wave beams are sent to user terminal, the distribution of asymmetric ground allocation of downlink business beam channel in available down-link frequencies by reusing at least one common downlink channel.
10. system according to claim 9, wherein, described gateway ground station further provides the downlink feeder beam between satellite and the described a plurality of gateway, forming a plurality of feeder beam overlay area,
Wherein described a plurality of uplink service wave beams are sent to satellite by reusing at least one common uplink channel, and relevant downlink feeder beam merges the information of described a plurality of uplink service wave beams of described satellite reception, and described satellite is reused to receive described at least one common uplink channel.
11. a satellite communication system of communicating by letter between central source and a plurality of user terminal by feeder line frequency band and service frequency bands, described system comprises:
Gateway ground station, be used for generating via satellite uplink feeder beam and downlink feeder beam, described uplink feeder beam and described downlink feeder beam characterize by the feeder signals of selecting to have the first frequency and the first polarization time slot, and each described feeder signals is corresponding with the different colours that first color in the color map is selected, and each color is characterized by unique frequency band and unique polarizations; And
A plurality of user terminals, be used to generate a plurality of uplink service wave beams and downlink traffic wave beam, described business beam characterizes by selecting the second frequency and the second polarization time slot, and each described feeder signals is corresponding with the different colours during second color in described color map is selected, described second color is chosen in and quantitatively is less than described first color selection, makes that feeder line frequency band and service frequency bands are asymmetric in available channel.
12. system according to claim 11 further comprises:
Controller, be used for reusing the frequency of the feeder beam between described satellite and described a plurality of gateway, at least one common channel of wherein reusing feeder beam is sent to satellite with the gateway wave beam and from satellite transmission gateway wave beam, makes that the frequency of feeder beam and the distribution of polarization time slot are asymmetric.
13. the satellite communication system of feeder line frequency band and service frequency bands method for communicating between central source and a plurality of user terminal is passed through in an application, described system comprises:
Controller, can operate and be used to revise the four look re-use pattern therefors that are used for the distributing point overlay area, make that the ratio of selection grouping of four colors in described pattern is unequal, allow the asymmetric traffic frequency on service downlinks to use thus, and need on number, be less than tradition to the type of frequency converter thus.
14. system according to claim 13, wherein, uplink service links is used three identical frequency bandwidths, each frequency bandwidth has two orthogonal polarizations, and downlink feeder links is used two frequency bandwidths, each frequency bandwidth has two orthogonal polarizations, and wherein asymmetric frequency bandwidth of reusing between uplink feeder link and the downlink feeder links, to reduce the required number of separation and the unique element on the satellite.
15. system according to claim 13, wherein, at least one uplink feeder beam comprises six carrier waves, wherein said wave beam comprises three channels, each of described three channels is operationally separated with left-hand circular polarization (LHCP) by right-handed circular polarization (RHCP), forming six unique combinations of frequency and polarization (color), and wherein said six carrier waves each only in six unique combinations of frequency of utilization and polarization send.
16. system according to claim 13, wherein, the downlink traffic wave beam comprises of four carrier waves, wherein select carrier wave from two frequency bands, each of described two frequency bands can be separated with left-hand circular polarization (LHCP) by right-handed circular polarization (RHCP), with four unique combinations of formation frequency and polarization (color), and wherein according to four look patterns, one in four unique combinations of each frequency of utilization of four carrier waves and polarization is sent to spot beam cells.
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| Application Number | Priority Date | Filing Date | Title |
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| US87008006P | 2006-12-14 | 2006-12-14 | |
| US60/870,080 | 2006-12-14 | ||
| US11/954,654 | 2007-12-12 |
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| CN108337923B (en) * | 2015-07-31 | 2021-02-09 | 维尔塞特公司 | Satellite, system and method for providing flexible capacity in a satellite constellation |
| CN106993312A (en) * | 2017-04-28 | 2017-07-28 | 北京邮电大学 | Based on the multi-beam load-balancing method for minimizing maximum transmission time in Information Network |
| CN106993312B (en) * | 2017-04-28 | 2020-02-07 | 北京邮电大学 | Multi-beam load balancing method based on minimum maximum transmission time |
| CN110677185A (en) * | 2018-07-03 | 2020-01-10 | 亚洲卫星有限公司 | High throughput satellite for relaying data between a low earth orbit satellite and an endpoint |
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